SR810 and SR830
DSP Lock-In Amplifiers
DSP LOCK-IN
AMPLIFIERS
SR810
Single Phase...$3650
SR830
Dual Phase...$3950
• 1 mHz to 102 kHz frequency range
(U.S. list)
(U.S. list)
he new SR810 and SR830 are
the latest additions to the
SRS family of DSP Lock-In
T
Amplifiers. The SR830 simultaneously measures the magnitude and
phase of a signal, while the SR810
measures the magnitude of a signal at
a specific phase. Both instruments
use digital signal processing (DSP) to
replace the demodulators, output filters and amplifiers found in conventional lock-ins. The SR810 and
SR830 provide uncompromised performance with an operating range of
1 mHz to 102 kHz and 100 dB of
drift-free dynamic reserve, outperforming all analog lock-ins.
Extended Dynamic Reserve
• 100 dB dynamic reserve without
pre-filtering (< 5 ppm stability)
• Auto-gain, phase and reserve
• Time constants from 10 s to 30 ks
(6, 12, 18, 24 dB/oct rolloff)
• Harmonic detection (2F, 3F, ... nF)
• Synthesized reference source
• Four 16-bit ADCs and DACs
• GPIB and RS-232 interfaces
Conventional lock-in amplifiers use
an analog demodulator to mix an
input signal with a reference signal.
Dynamic reserve is limited to about
60 dB, and these instruments suffer
from poor stability, output drift and
excessive gain and phase error.
Demodulation in the SR810 and
SR830 is accomplished by sampling
the input signal with a high precision
A/D converter, and multiplying the
digitized input by a synthesized
reference signal. This digital demodulation technique results in more than
100 dB of true dynamic reserve (no
pre-filtering) and is free of the errors
associated with analog instruments.
Using DSP, a small signal embedded
in noise that’s a million times larger
can easily be measured.
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